#include<iostream>
#include<string>

using namespace std;

int main()
{
  cout<<"jiejie2021"<<endl;
  string s1("scout2021");
  string s2(s1);
  string s3(10,'c');
  std::string::iterator it = s1.begin();
  for(it = s1.begin();it != s1.end();++it)
  {
    cout<<*it<<" ";
  }
  cout<<endl;
  std::string::iterator t = s3.begin();
  for(it = s3.begin();it != s3.end();++it)
  {
    cout<<*t;
  }
  cout<<endl;
  s2 += "LOL champlinng";
  
  std::string::iterator ti = s2.begin();
  for(ti = s2.begin();ti != s2.end();++ti)
  {
    cout<<*ti;
  }
  cout<<endl;

  return 0;
}
